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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Net income (loss) $ 12.2 $ (67.0)
Prior service credit arising during the period 0.0 (3.6)
Amortization of prior service costs (credits) (0.1) (0.3)
Other comprehensive income (loss), before tax (0.1) (3.9)
Income tax expense related to items of other comprehensive income 0.0 0.0
Other comprehensive income (loss), net of tax (0.1) (3.9)
Comprehensive income (loss) $ 12.1 $ (70.9)